Merged kernel support for ELF executable format from karolina.lindqvist.

Now kernel can directly run executables generated by gcc.
2014-04-23 21:43:09 -07:00
parent 8d5a6f60b1
commit 3a38f291a7
35 changed files with 1881 additions and 542 deletions
--- a/sys/kernel/exec_script.c
+++ b/sys/kernel/exec_script.c
@@ -0,0 +1,96 @@
+#include "param.h"
+#include "inode.h"
+#include "dir.h"
+#include "namei.h"
+#include "exec.h"
+#include "user.h"
+#include "systm.h"
+
+int
+exec_script_check(struct exec_params *epp)
+{
+	char *cp;
+	struct nameidata nd;
+	struct nameidata *ndp;
+	int error;
+	struct inode *ip = 0;
+
+	/*
+	 * We come here with the first line of the executable
+	 * script file.
+	 * Check is to see if it starts with the magic marker:  #!
+	 */
+	if (epp->hdr.sh[0] != '#' || epp->hdr.sh[1] != '!' || epp->sh.interpreted)
+		return ENOEXEC;
+	epp->sh.interpreted = 1;
+
+	/*
+	 * If setuid/gid scripts were to be disallowed this is where it would
+	 * have to be done.
+	 * u.u_uid = uid;
+	 * u.u_gid = u_groups[0];
+	 */
+
+	/*
+	 * The first line of the text file
+	 * should be one line on the format:
+	 * #! <interpreter-name> <interpreter-argument>\n
+	 */
+	cp = &epp->hdr.sh[2];
+	while (cp < &epp->hdr.sh[MIN(epp->hdr_len, SHSIZE)]) {
+		if (*cp == '\t')
+			*cp = ' ';
+		else if (*cp == '\n') {
+			*cp = '\0';
+			break;
+		}
+		cp++;
+	}
+	if (cp == &epp->hdr.sh[MIN(epp->hdr_len, SHSIZE)])
+		return ENOEXEC;
+
+	/*
+	 * Pick up script interpreter file name
+	 */
+	cp = &epp->hdr.sh[2];
+	while (*cp == ' ')
+		cp++;
+	if (!*cp)
+		return ENOEXEC;
+	bzero(&nd, sizeof nd);
+	ndp = &nd;
+	ndp->ni_dirp = cp;
+	while (*cp && *cp != ' ')
+		cp++;
+	if (*cp != '\0') {
+		*cp++ = 0;
+		while (*cp && *cp == ' ')
+			cp++;
+		if (*cp) {
+			if ((error = copystr(cp, epp->sh.interparg, sizeof epp->sh.interparg, NULL)))
+				goto done;
+		}
+	}
+
+	/*
+	 * the interpreter is the new file to exec
+	 */
+	ndp->ni_nameiop = LOOKUP | FOLLOW;
+	ip = namei (ndp);
+	if (ip == NULL)
+		return u.u_error;
+	if ((error = copystr(ndp->ni_dent.d_name, epp->sh.interpname, sizeof epp->sh.interpname, NULL)))
+		goto done;
+
+	/*
+	 * Everything set up, do the recursive exec()
+	 */
+	if (epp->ip)
+		iput(epp->ip);
+	epp->ip = ip;
+	error = exec_check(epp);
+done:
+	if (ip)
+		iput(ip);
+	return error;
+}